Finding the Fourth Proportional to 90,983.86, 136,552.47 and 38,431.06

Step by Step Solution

1. Step 1: Write the proportion equation
   90,983.86 : 136,552.47 = 38,431.06 : x
2. Step 2: Convert to fraction form
   90,983.86/136,552.47 = 38,431.06/x
3. Step 3: Cross multiply
   90,983.86x = 136,552.47 × 38,431.06
4. Step 4: Simplify right side
   90,983.86x = 5,247,856,167.72
5. Step 5: Solve for x
   x = 5,247,856,167.72/90,983.86
6. Step 6: Final answer
   x = 57,678.98